Roller bit



June 16, 1931. G. E; BEHN'KE 1,8 0 20 ROLLER B'IT Filed April 6. 1928 4 bits.

It has for its general object the provision Cal Patented June 16,. 1931 UNITED STATES PATENT OFFICE GUY E. BEHNKE, OF HOUSTON, TEXAS, ASSIGN'OR T0 REED. ROLLER BIT COMPANY, vHO'l'IS'IOl T, TEXAS, A CORPORATION OF TEXAS 1 ROLLER BI'J.

Application filed *April 6, 1928. Serial No. 267,877.

This invention relates to deep well drilling apparatus and more particularly to roller of new and improved means to support roller cutters in a bit head.

One of its specific objects is to provide, in a roller bit of the type embodying side roller cutters and cross roller cutters, means whereby all of the cutters. may quickly and easily be mounted in and removed from the head.

Various other objects of the invention will hereinafter appear.

In the accompanying drawings, which are illustrative of the preferred embodiment of.

the invention, Fig. 1 is a partly sectional side elevation of the bit; Fig. 2, a sectional elevation taken at right angles to Fig. 1; Fig. 3, a bottom plan view; and Fig. 4, a fragmentary elevation taken at right angles to Fig. p

1 and illustrating the reduced end of the support in the slot of the head.

Referring more specifically to .the drawings, the bit head is indicated 'at 1, and it has in the bottom thereof a recess 2 formed by the side roller cutter extensions 3 and the ing to the elements above referred to are dis closed in the patent toWm L. Childs, et al., No. 1,656,471, of January '17 th, 1928.

Attention is now invited to the new and useful improvements vprovided by the present invention. To support the cross roller cutters 6 and the side roller cutters 5 in the recess 2, I provide the support 7. The support? is made in one piece and is substantially U-shaped, its arms constituting spindles and its base a bridge. The bridge portion 7 a is rectangular in cross section. Each of the spindle ortions comprises the cylindrical parts- 0 having a reduced extension 7d slidable in the slot-9 in the side roller cutter extension 3 p of the head. Enlarged cylindrical ortions 7 b are disposed between said bri ge and spindles.

' quickly It will be understood that all of the parts of the support aremtegral with each other, and t will be noted that the bridge portion extends horizontally across the recess and that the spindle portions extend upwardly and outwardly. 1

The cross roller cutters 6 are so spaeedbn the pin 8 that they will travel in different (airarts 7 0 and 7 d however are in the plane of the vertical axis of the head.

- The assembly of the parts and the advanpages thereof may briefly be outlined as folows:

The bushings 10, side roller cutters 5 and washers. 11 are first placed upon the spindle portions of the support... The support. with the said roller cutters thereon may then be slipped into the recess 2 of the head, the reduced extensions 7-d moving upwardly in the slots 9..The cross roller cutters 6 and their bushings are then held in place and the pin 8 is passed laterally through the bore in thatextension 4 to the left in Fig. 2, through the bushings of the crossroller cutters 6', the opening in the bridge 7a and into the bore in that extension. 4 shown to the right in Figx2. The in 8 will therefore hold the support 7 infithe head. The pin 12 is then inserted to lock the assembled parts in place.

' The pin 8 may be provided with the usual eccentric head 8a and locking pins 14 may be employed as shown.

It will be observed that the parts may be and easily assembled. The parts may be separated by simply removing the ins 8, 12, and 14.

It will be understood that the use of the pins 14 may be'dispensed with if desired,

one of the main features of my invention be- The axes of the enlarged parts 7b and the axes of spindle ing the provision of means whereby the entire cutter assembly may be held in place bythe single cross roller cutter pin 8. The pin 8 supports and is supported by the support in a manner that will be obvious to those skilled in the art.

Roller bits now in use embody a head having a number of cutter pockets or recesses. Attention is invited to the fact that this invention provides a head having a single recess 2, which can cheaply be manufactured. And as it afiords more cutter space, the side roller cutters 5 and the cross roller cutters 6 may be made relatively larger. The proper circulation about the cutters of slush issuing from the slush courses is also insured.

The invention is not limited to the preferred embodiment shown. Various changes may be made without departing from the scope of the following claims:

I claim:

1. A roller bit having a head with a recess in the bottom thereof, and slots in the walls of said recess, the surfaces of said walls being inclined upwardly and inwardly toward the vertical axis of the head, a support extending across said recess and having a bridge portion and a pair of spindle portions, said spindle portions extending upwardly and outwardly at an angle to said bridge portion and having ends slidable in said slots, side roller cutters on said spindle portions and adjacent the said surfaces of said walls, a pin carried by the head and extending across said recess and through said bridge portion, and cross roller cutterson saidpin.

2. In a roller bit, a head having a recess in the bottom thereof and slots in the walls of said recess, a support for said walls, said support extending across said recess and having reduced ends slidable in said slots, a roller cutter pin carried by the head, extending across said recess and connected to said support to hold said support in place, and roller cutters on said pin.

3. In a roller bit, a head having a cutter recess in its bottom and slots and bores in the walls of said recess, a support having a bridge portion with an opening therein and a-pair of roller cutter spindle portions, said support being slidable upwardly into to extend across said recess, said spindle portions being slidable upwardly into said slots, a roller cutter pin laterally slidable into said bores and opening across said recess to hold said support in said head, and roller cutters on said spindles and pin.

4. In a roller bit, a head having a cutter recess in its bottom and slots and bores in the walls of said recess, said bores being in onsaid spindleportions, said spindle portions being slidable upwardly into said slots, a cutter pin laterally slidable into said bores and opening across said recess to hold said support in said head, and roller cutters on said pin.

5. In a roller bit,a head having a cutter recess in its bottom and slots and bores in the walls of said recess, a one piece substantially U-shaped support, the arms of said support constituting cutter spindles, and the base of said support a bridge having an opening therein, roller cutters on said spindles, said spindles being slidable upwardly into said slots, a cutter pin laterally slidable into said bores and opening across said recess to hold said support in said head, and rolle cutters on said pin.

6. A roller bit having a'cutter recess and bores and slots in the walls of said recess, a

one piece substantially U-shaped support, the

arms of said support constituting cutter spindles, and the base of said support a bridge having an opening therein, said support having enlarged portions between said spindles and said bridge, said spindles being slidable upwardly into said slots, cutters on said spindles, a cutter pin slidable laterally into said bores and opening across said recess to hold said support in said head, and roller cutters on said pin.

'7. A roller bit comprising a head having a cutter recess and bores and slots in the walls of said recess, said bores being disposed in a plane substantially at a right angle to the plane of said slots, a support having spindles slidable into said slots, a pin laterally slidable into said bores and across said recess to en-' gage and hold said support in said head, and

roller cutters on said spindles and pin.

8. A roller bit comprising a head having a cutter recessand diametrically opposite bores and slots in the walls of said recess, said bores being disposed in a plane substantially at a right angle to the plane of said slots, a sub stantially U-shaped support, the arms of said support constituting spindles and the base of said support a bridge, said spindles being slidable into said slots, a pin laterally slidable into said bores and across said recess to engage said bridge and hold said support in said head, and roller cutters on said spindles and pin.

In testimony whereof, I hereunto afiix my signature.

GUY E. BEHNKE. 

